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File folding technique

  • US 7,072,910 B2
  • Filed: 03/22/2002
  • Issued: 07/04/2006
  • Est. Priority Date: 03/22/2002
  • Status: Active Grant
First Claim
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1. A method for reducing duplicate data of a file stored on a storage device of a server having an active file system, the method comprising the steps of:

  • generating a persistent image of old data for the file in the active file system;

    overwriting the old data of the file in the active file system with new data;

    comparing contents of the data blocks for the active file system and persistent image on a block-by-block basis;

    determining whether the new data is identical to the old data of the persistent image; and

    if so, folding the new data of the file in the active file system into the old data of the persistent image.

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